| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BLETCHLEY PARK TRUST LIMITED | 02730618 | 12/02/2019 | 11/10/2024 | Silver |
| CERES POWER HOLDINGS PLC | 05174075 | 04/02/2008 | 29/02/2012 | Amber |
| DOMINO PRINTING SCIENCES PUBLIC LIMITED COMPANY | 01363137 | 01/08/2008 | 11/06/2015 | Gold |
| DRS DATA AND RESEARCH SERVICES LIMITED | 00959401 | 01/08/2008 | 18/05/2015 | Dissolved |
| LD TRAINING LIMITED | 03980770 | 26/05/2000 | 30/06/2003 | Insolvent |
| MOTOROLA SOLUTIONS PENSION TRUSTEES LIMITED | 06445533 | 07/12/2007 | 31/07/2008 | Not Trading |
| MOTOROLA SOLUTIONS UK LIMITED | 00912182 | 09/01/1995 | 31/07/2008 | Silver |
| SIMOCO WIRELESS SOLUTIONS LIMITED | 07038450 | 01/11/2010 | 31/07/2018 | Amber |
| SYMBOL TECHNOLOGIES LIMITED | 01096253 | 28/02/2007 | 31/07/2008 | Dissolved |
| SYMBOL TECHNOLOGIES UK LIMITED | 03227022 | 28/02/2007 | 31/07/2008 | Dissolved |
| TECHUK LTD | 01200318 | 16/05/2002 | 17/11/2004 | Silver |
| THE BRITISH STANDARDS INSTITUTION | ZC000202 | 15/08/2011 | 31/12/2018 | Gold |
| THE LIVING PAINTINGS TRUST | 03095963 | 02/08/2019 | 04/08/2022 | Silver |
| THE MANUFACTURING TECHNOLOGY CENTRE LIMITED | 06815480 | 01/10/2019 | 08/08/2021 | Silver |
| THE PENINSULAR AND ORIENTAL STEAM NAVIGATION COMPANY | ZC000073 | 16/01/2002 | 08/03/2006 | Bronze |
| TTP COMMUNICATIONS LIMITED | 03962172 | 23/01/2007 | 31/07/2008 | Silver |
| TTPCOM LIMITED | 03475732 | 23/01/2007 | 31/07/2008 | Silver |
| The Federation of The Electronics Industry | 04095789 | 01/01/2001 | 15/05/2002 | Dissolved |
| UFI VOCTECH TRUST | 03658378 | 24/03/1999 | 30/06/2003 | Silver |